将日期时间从NSString转换为NSDate

Question

Time zone always made trouble for me. This time I have to convert date-time , that I have in NSSTring to NSDate.

I am doing something like this.

NSString *myStringDate=@"14-11-2012 4:09:00 PM +0500"

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setTimeZone:[NSTimeZone systemTimeZone]];
[formatter setDateFormat:@"dd-MM-yyyy h:mm:ss a Z"];

NSDate *aDate = [formatter dateFromString:myStringDate];
NSLog(@"%@",aDate);

but I am having the output like this

14-11-2012 11:09:00 +0000

Also, no AM/PM is setting :-(

What I want is 14-11-2012 4:09:00 PM +0500 ie same Date-Time that I have in string.

Thanks in anticipation.

Answer 1

the output of your converting is giving the GMT time

NSString *myStringDate=@"14-11-2012 4:09:00 PM +0500"

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setTimeZone:[NSTimeZone systemTimeZone]];
[formatter setDateFormat:@"dd-MM-yyyy h:mm:ss a Z"];

NSDate *aDate = [formatter dateFromString:myStringDate];



 NSDateFormatter* df_utc = [[[NSDateFormatter alloc] init] autorelease];
 [df_utc setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];
 [df_utc setDateFormat:@"yyyy.MM.dd G 'at' HH:mm:ss zzz"];

 NSDateFormatter* df_local = [[[NSDateFormatter alloc] init] autorelease];
 [df_local setTimeZone:[NSTimeZone timeZoneWithName:@"EST"]];
 [df_local setDateFormat:@"yyyy.MM.dd G 'at' HH:mm:ss zzz"];

 NSString* ts_utc_string = [df_utc stringFromDate:aDate];
 NSString* ts_local_string = [df_local stringFromDate:aDate];

Answer 2

Here Is the Change need to be taken.

[formatter setDateFormat:@"dd-MM-yyyy h:mm:ss a "];

Thanks

Answer 3

The conversion looks correct, but the default output is in UTC time ( +0000 ) and with a 24h clock which is why you don't get the AM/PM distinction (“01:00 PM” would be 13:00). You also need to format the output if you want a specific representation ( [formatter stringFromDate:aDate] )…

For the UTC issue you need to select the time zone of your choice, by giving that choice in place of [NSTimeZone systemTimeZone] . Try [NSTimeZone localTimeZone] for starters.